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One scientific belief held by both rené descartes and isaac newton is that (1) reasoned thought is the way to discover truth (2) new theories should be made to fit existing traditional ideas (3) the method by which discoveries are made is unimportant (4) difficult problems should be solved by reading religious texts

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Answer;
One scientific belief of both Rene Descartes and Isaac Newton is that the idea of ​​reasoning is the way to discover the truth.

Explanation;
Rene Descartes used deductive reasoning, concluding from a series of dwellings, to determine the nature of the universe, which was contrary to other great thinkers of the time who used scientific observation.
Sir Isaac Newton; specialized in unifying the experimental and theoretical elements of modern science.